Olof jtilsson rikof



Sept. 23, 1.924. 1,509,260-

O. N. RIKOF SAND AND LIKE WASHING AND SEPARA'IING MACHINE Original Filed July 14, 1921 To all whom it may concern.

Patented Sept. 23, 1924.

UNITEDSTATES PATENT orrics.

'onor NrLssoN RIKOE, or BROXBOURNE, ENGLAND.

snnnnnn LIKE WASHING- AND sErAaArmeMAoHmE.

Original application filed July 14,1921, Serial N0. 484=,789. Divided and this application filed April 12,

Be it known thatI, OLor NILSSON RIKOF, a subject of the King of England, residing at Broxbourne, England,have invented certain Improvements in Sand and Like Washing and SeparatingMachines, for which I have filed applications in Great Britain, on June 10th, 1914, Germany, on May 10th, 1920, F rance,.on May 12th, 1920, of which the following is a specification.

For the purpose of recovering the fine sand from the sludge discharged by sand washing and separating machines," it has been proposed to feed such sludge into buckets which are carried slowly by endless chains over an inclined guideway in such a manner as to be gradually tilted from the receiving position for decanting the water,

the sand, which settles during the tilting of the buckets, being discharged when the buckets are reversed at the commencement of the return movement.

This arrangement has the disadvantage of being too complicated and very-heavy to drive, the driving of the buckets over a guideway requiring a great deal of power. Besides, the joints of the numerous chain links are likely to get contaminated with mud so as to wear speedily and add to the friction. I

Another known method of separating fine sand from washing water, is to discharge the sludge into buckets or pockets carried by a cylindrical drum which revolves slowly so that the sand can settle while the water is discharged over the edges of the buckets or pockets by the gradual tilting of the same. Consisting as it does of a single rotary element, this arrangement is very simple and easily operated, but it is accompanied by the disadvantage that the Water is liable to flow over the edges from one pocket into another, thereby stirring up 5 the contents and tending to wash away the valuable fine sand particles. Besides, there are difficulties connected with the satisfactory arrangement of the delivery chutes.

These disadvantages are obviated by the arrangement according to the present invention which consists in the provision of a slowly revolving conical drum which receives the sludge in tapering pockets which are open at the narrow end so that the, water, instead of being discharged over the, edges of the pockets, will be discharged entirely 1922. Serial No. 551,988.

at the open, narrow end of the same. Owing to this arrangement, a uniform discharge of the water and an effective separation therefrom of the fine sand particles will be achieved. Moreover, the water can be read ily collected and led away from the narrow end of the drum, the entire space underneath the drum being available for the disposal of the sand.

In the accompanying drawings, the invention is illustrated by way of example,

Fig. 1 representing a side view of the drum as seen from the right of Fig. 2, only two of the pockets being shown for the sake of clearness.

Fig. 2, is a section of the complete drum on the line AB of Fig. 1 and seen from the left of that figure.

The device consists of a conical drum at having a plurality of external vanes b which are constructed and arranged so as to form pockets which taper towards the narrow end of the drum and open into the rotating direction of the same. A plate a at the wide end of the cone closes the pockets at this end, the narrow end being open. The sludge delivered by the ordinary washing and separating machine, is received by a chute cl which in its turn delivers it into the pockets of the cone or as these pass upwards at the side of the cone. While the outer edges of the pockets lie in a plane coinciding with the axis of the cone, the bottom of each pocket is inclined to this plane and will therefore also be inclined to the horizontal,

as shown in Fig. 1, at the time of receiving the charge. As the pocket then inclines towards the closed end, the charge will be retained until the pocket has passed out of receiving position. Then, as the pocket passes up over the cone in the direction of the arrow, and while the sand particles settle in the now calm liquid, the inclination of the pocket will be gradually directed towards the open end where the water will be slowly decanted, as shown in Fig. 1. The sand will remain in the pocket until the position of the latter is reversed at the opposits side of the drum where it will be discharged, as shown in Fig. 2. Thus, while the pocket 6 in Fig. 1 receives its charge, the Water in the pockets 6 is being decanted, and the sand is being discharged from the pockets b In this manner an effective continuous sep from the sludge discharged by a sand washing and separating machine, comprisinga slowly revolving cone, longitudinal" pockets fitted externally on said cone for the reception of the sludge, the pockets. being open at the narrow, and closed at; the wide end of the cone so as to retain the sludge while the sand settles and so as to deoantv the water at the narrow end by the gradual tilting of the pockets when passing over the cone, substantially as set forth.

2, A; devise tor separating the fine s from the sludge discharged by: a, sand washing and separating machine, comprising a slowly revolving cone, longitudinal pockets fitted" externally on said cone for the reception of the sludge, the outer edges of the pockets being in a plane coinciding with the axis of thecone, thebottom. of the poekets being ginolined to such plane, the pockets being open at the narrow, and closed at the wide end of the cone so as to retain thesludge while the sand settles andso as to cleoant the water at the narBOW' end by the gradual tilting of the pockets when passing over the cone, subs tantia-llyas set forth.

OLOF NILSSON RIKOF. 

